The paper reports that Jack Letts, a 20-year-old man originally
from Oxford, joined the radical Islamist group and secretly
traveled to Syria two years ago.

Letts apparently converted to Islam while living in Oxford, and
attended the Madina Masjid mosque in the city.

He comes from a non-Islamic background: His family is reportedly
secular, his father working as an organic farmer and
archaeobotanist, and his mother as a books editor. He studied at
Cherwell school, supported Liverpool football club, and allegedly
drank alcohol and smoked cannabis before his conversion.

Letts was reportedly nicknamed "Jihadi Jack" by his peers in
Oxford.

The moniker mirrors "Jihadi John," another high-profile British
Islamic State militant. The former Londoner, really named
Mohammed Emwazi, became infamous after appearing in ISIS
execution videos of Western journalists and aid workers including
James Foley and Steven Sotloff. Emwazi was killed in a drone
strike in November 2015.

Jack Letts now apparently uses the name Abu Muhammed, and married
a woman from Fallujah in Iraq after he came to Syria.
The Daily Mail reports he has a son, named Muhammed. He is
apparently a frontline fighter, and lives in the Syrian city
Raqqa.

A
photo that The Daily Mail reports shows the interior of Letts'
home in Raqqa.The Daily
Mail

He reportedly first traveled to Syria after telling his parents
he was going to study Arabic in Kuwait. According to The Sunday
Times, Letts revealed to his parents the truth in September 2014.
A source to "close to his family" told the paper: "His mother and
father were extremely worried for his safety after he told them
that he was in Syria. The past two years have been a real
nightmare for them. They just wish he can be back home with
them."

The Daily Mail and The Sunday Times have both seen photos Letts
posted to social media apparently showing him in Syria. A
Facebook profile for a "Jack Letts" from Oxford that shows photos
that The Daily Mail reports are of Letts has its profile picture
set of a smoke cloud from an apparent explosion seen from a roof
in what seems to be a Middle Eastern setting. In a comment from
May 2015, Letts says he is "travelling."

According to The
BBC, more than 700 people have traveled from Britain to Syria
and Iraq to support jihadist groups — mostly ISIS, also known as
Islamic State.